The measurement of weak current on water surface under wind wave environment is a significant procedure for studying the interaction between current and wind waves,which is very important for the microwave remote sensing of internal waves,submarine topography and eddy etc.Traditional measurement methods can not work under wind wave environment,and then make it hard to study the interaction effect between current and wind waves.A new method for measuring weak current under wind wave environment based on linear array CCD is proposed in this paper.The wave tank experiment with surface current caused by internal waves is carried out to prove the validity of this method.Then the experimental data show that the measuring precision of water surface weak current velocity is better than 0.3cm/s.The experiment indicates that this method can be used to measure the weak current under wind wave environment and research the interaction between current and wind waves.